I took this map from Canterbury council's web page and made changes to show our route overview.

The red route is the Via Francigena, a medieval pilgrim's route from Canterbury to Rome. We intended to follow this initially but due to lack of good information on how bike-friendly it was we opted for something else.

Green is the hypothetical EuroVelo Route 5, from London to Rome&Brindisi. It doesn't exist yet, but we were able to use a lot of it as a framework.